It is indeed a happy circumstance that on the day after the incident TOI carried this report:

Wildlife experts described Wednesday’s accident that saw the death of seven elephants on railway tracks in the Dooars as one of the blackest days in the history of wildlife conservation in India.

Most experts TOI spoke to urged the railways to withdraw goods trains on the route at night and to make sure that a speed limit was maintained.
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In fact, Wild Life Trust of India is also thinking of replicating the Rajaji National Park model in north Bengal. “In 18 kilometre stretch, elephant death by trains were frequent. But ever since, we began the save wild life project along the train track, not a single case happened,” said Ashok Kumar of Wild Life Trust of India. The Rajaji model includes sensitising motormen, regular patrolling along the track, slowing down the speed of the train particularly at the blind turns and wireless communication between the motormen and forest guards. “We are now implementing the same model in Mahananda wild life sanctuary. In north Bengal it would be definitely of a larger scale,” said Kumar.